Page 176 of 430
173 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Defrosting
Press the P button. The display shows P.
Maximum heated and automatically controlled amount
of air is directed to the defroster and windshield air
outlets.
Pressing the Pbutton again returns the system to
the previous setting.Windows fogged on the inside
Switch off the economy mode, if selected: Press
button AC
OFF
. The indicator lamp in the button will go
out.
Switch off air recirculation, if selected: Press
buttonO. The indicator lamp in the button will go
out.
Adjust left and right air outlets upwards.
Set blower to the maximum blower speed.
Increase temperature setting.
Open the side air outlets and direct them onto the side
windows.
Windshield fogged on the outside
Switch on the windshield wiper.
Press on both U buttons until they click in. The
h, j and k symbols will no longer be visible.
P83.40-2009-21
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174 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Air recirculation
Select air recirculation:
The indicator lamp in the O button is not
illuminated.
Press button O briefly. The indicator lamp in the
button illuminates.
To switch off the air recirculation:
The indicator lamp in the O button is illuminated.
Press button O briefly. The indicator lamp in the
button will go out.
Switching on air recirculation and activating
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the O button is not
illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof will be closed. The
indicator lamp in the button lights up.Switching off air recirculation and activating
convenience opening of power windows and sliding /
pop-up roof:
The indicator lamp in the O button is illuminated.
Press button O for more than 2 seconds, the side
windows and the sliding / pop-up roof return to the
position they were in before closing.
A window or the sliding / pop-up roof opened manually
after convenience closing will no longer be returned to
the position it was in before closing when convenience
opening is selected.
The system automatically switches from air
recirculation to fresh air:
•after 30 minutes if the outside temperature is above
about 40
°F(5
°C),
•after 5 minutes if the outside temperature is below
about 40
°F(5
°C),
•after 5 minutes if economy mode AC
OFF is selected.
The system switches automatically to air recirculation at
high outside temperatures. A quantity of outside air is
added after a maximum of 30 minutes.
If the windows should fog up from the inside, switch
from recirculated air back to fresh air.
Page 178 of 430

175 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Activated charcoal filter
An activated charcoal filter markedly reduces bad odors
and removes pollutants from air entering the passenger
compartment.
Select activated charcoal filter:
The indicator lamp in the e button is not
illuminated.
Press e button briefly. The indicator lamp in the
button illuminates.
Switch off activated charcoal filter:
The indicator lamp in the e button is illuminated.
Press e button briefly. The indicator lamp in the
button goes out.
The system switches automatically to the air
recirculation mode, if the carbon monoxide (CO) or
nitrogen oxides (NO
X) concentration of the outside air
increases beyond a predetermined level.
The automatic air recirculation mode does not function
if economy mode ACOFF
is selected or if the outside
temperature has fallen below 40
°F(5
°C). The activated charcoal filter should be switched off
when windows fog up on the inside, or if the passenger
compartment needs to be quickly heated or cooled
down.
Switching on the activated charcoal filter and activating
convenience closing of power windows and sliding /
pop-up roof:
The indicator lamp in the e button is not
illuminated.
Press button e for more than 2 seconds, the side
windows and the sliding / pop-up roof will be closed. The
indicator lamp in the button illuminates.
Switching off activated charcoal filter and activating
convenience opening of power windows and sliding /
pop-up roof:
The indicator lamp in the e button is illuminated.
Press button e for more than 2 seconds, the side
windows and the sliding / pop-up roof return to the
position they were in before closing. The indicator lamp
in the button goes out.
Page 179 of 430

176 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Economy mode
The function of this setting corresponds to the
automatic mode. However, because the air conditioning
compressor will not engage (fuel savings), it is not
possible to air condition in this setting.
Press AC
OFF
button to activate. The indicator lamp in the
button illuminates.
Press AC
OFF
button once again to return to the previous
setting. The indicator lamp in the button goes out.
Important!
In the ACOFF
mode the windows could fog up on the
inside. Switch off AC
OFF mode.Residual engine heat utilization
With the engine switched off, it is possible to continue
to heat or ventilate the interior for a short while,
dependent of the temperature setting of the automatic
climate control. Air volume and distribution are
controlled automatically.
To s e l e c t :
Turn the electronic key in starter switch to position 1
or 0 or remove it altogether.
Press button T. The display shows “REST”.
This function selection will not activate if the battery
level is insufficient.
Page 180 of 430

177 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index The function switches off automatically:
•if the electronic key in starter switch is turned to
position 2,
•after approximately 30 minutes (if residual engine
heat utilization is selected on the optional rear air
conditioner: after approximately 15 minutes),
•if the battery voltage drops.
Note:
The battery symbol # will appear in the automatic
climate control display some time before the residual
engine heat utilization is switched off if the battery
voltage drops.Switching the automatic climate control on and off
To switch off:
Press buttonM. The display shows “0”.
The fresh air supply to the vehicle interior is shut off.
While driving, use this setting only temporarily,
otherwise the windshield could fog up.
To switch on:
•press buttonM or P,
•press one of the U buttons so that it pops out and
then click it back in,
•press one of the temperature selector buttons or the
air volume switch.
Page 181 of 430
178 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Front center console storage compartment
ventilation
The front center console compartment has its own air
outlet.
To open: Slide the lever up.
To close: Slide the lever down.
The air volume is dependent on the setting of:
•air distribution control,
•air volume control,
•air outlets in the dashboard.
The air temperature is about the same as that of the
dashboard air outlets. It cannot be regulated separately.Note:
The compartment can get very warm due to its confined
space. When storing heat sensitive objects in the
compartment, close the air outlet while heating the
passenger compartment.
Do not allow articles to obstruct the air outlet in the
storage compartment.
Page 182 of 430
179 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Rear passenger compartment adjustable air outlets
1Center air outlet, left
2Center air outlet, right
3Air volume control for center air outlets
(vehicles without rear air conditioner)
To open: Turn the wheel to the left.4Rear side air outlet, right and left
5Air volume control for rear side air outlet
To open: Turn thumbwheel towards the window.
P83.00-0372-26
1
2
3
45
P68.00-0767-26
Page 183 of 430

180 Automatic climate control
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Rear passenger compartment climate control
(optional, standard on model S 600)
1On / off
Residual engine heat utilization, see page 176.
2Display
Depending on the ambient light conditions, the
figures on the display will be shown as dark figures
on a bright background (in daylight) or as, bright
figures on a dark background (at night).3Air distribution up / down
4Temperature control, right
5Air volume (automatic, manual)
6Temperature control, left
7Adjustable rear center air outlet, left
8Adjustable rear center air outlet, right
Note:
The rear air conditioner will not cool the air if the
AC
OFF
button on the automatic air conditioner is
pressed.
The temperature on both sides is automatically set to
the settings of the automatic air conditioner if the rear
seats are not occupied (rear seat belts unbuckled).
7
8
1
3
2
4
6
5
P83.00-0371-26